砌筑砂浆应随伴随用,一般应在2h之内用完,气温低于10℃时可延长至( )。
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墙身砌筑的原则是( )。
A. 角砖要平,绷线要紧
B. 上灰要准、铺灰要活,上跟线、下跟棱
C. 皮数杆要立正立直
D. A+B+C
无符号二进制整数10000001转换成十进制整数的是
A. 119
B. 121
C. 127
D. 129
From the text we can learn that Mr. Starr is very ______ as a historian.
A. conservative
B. cunning and shrewd
C. objective and canny
D. critical and aggressive
The phrase "sine qua non" in Para. 5, Line 1 possibly means ______.
A. the essential elements
B. the premise
C. the contribution
D. the advantage